![]() It is a simple non-inverting comparator circuit. LED1 immediately will glow and BZ1 will emit sound. By installing this circuit to the output of the battery, if the battery voltage got to lower than 8.3V. Some circuits may misfunction when a 9V battery powering them voltage level got lower than 8V. Related Posts 9V Low Voltage Battery Alarm Circuit ![]() It gives an alarm when the battery voltage level is lower than the set point. Secondly, is a practical 12V low voltage battery Indicator circuit.We tried to build this circuit to start learning how the LM339 Quad Comparator works. ![]() First, is a 9V low voltage battery alarm circuit.It can sense a drop in voltage of 2 or so millivolts, for example when the voltage drops from 12.400V to 12.398V. The LM339 Quad Comparator is another type of op-amp specially designed for voltage-sensing circuits, so it is very accurate. Both circuits can be used to detect the voltage level with a comparator circuit using LM339. Another is a circuit that we currently use. The first circuit is used mainly to visualize the principle of a comparator circuit using OP-AMP. By showing on LED and with a buzzer sound alarm. It can be used as a voltage monitor for other voltage sources that might have the same problems. ![]() But it would be more convenient if we used this circuit instead. We may measure the voltage of the battery with a common voltmeter. ![]()
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